Merge tag 'balancenuma-v11' of git://git.kernel.org/pub/scm/linux/kernel/git/mel...

Pull Automatic NUMA Balancing bare-bones from Mel Gorman:
 "There are three implementations for NUMA balancing, this tree
  (balancenuma), numacore which has been developed in tip/master and
  autonuma which is in aa.git.

  In almost all respects balancenuma is the dumbest of the three because
  its main impact is on the VM side with no attempt to be smart about
  scheduling.  In the interest of getting the ball rolling, it would be
  desirable to see this much merged for 3.8 with the view to building
  scheduler smarts on top and adapting the VM where required for 3.9.

  The most recent set of comparisons available from different people are

    mel:    https://lkml.org/lkml/2012/12/9/108
    mingo:  https://lkml.org/lkml/2012/12/7/331
    tglx:   https://lkml.org/lkml/2012/12/10/437
    srikar: https://lkml.org/lkml/2012/12/10/397

  The results are a mixed bag.  In my own tests, balancenuma does
  reasonably well.  It's dumb as rocks and does not regress against
  mainline.  On the other hand, Ingo's tests shows that balancenuma is
  incapable of converging for this workloads driven by perf which is bad
  but is potentially explained by the lack of scheduler smarts.  Thomas'
  results show balancenuma improves on mainline but falls far short of
  numacore or autonuma.  Srikar's results indicate we all suffer on a
  large machine with imbalanced node sizes.

  My own testing showed that recent numacore results have improved
  dramatically, particularly in the last week but not universally.
  We've butted heads heavily on system CPU usage and high levels of
  migration even when it shows that overall performance is better.
  There are also cases where it regresses.  Of interest is that for
  specjbb in some configurations it will regress for lower numbers of
  warehouses and show gains for higher numbers which is not reported by
  the tool by default and sometimes missed in treports.  Recently I
  reported for numacore that the JVM was crashing with
  NullPointerExceptions but currently it's unclear what the source of
  this problem is.  Initially I thought it was in how numacore batch
  handles PTEs but I'm no longer think this is the case.  It's possible
  numacore is just able to trigger it due to higher rates of migration.

  These reports were quite late in the cycle so I/we would like to start
  with this tree as it contains much of the code we can agree on and has
  not changed significantly over the last 2-3 weeks."

* tag 'balancenuma-v11' of git://git.kernel.org/pub/scm/linux/kernel/git/mel/linux-balancenuma: (50 commits)
  mm/rmap, migration: Make rmap_walk_anon() and try_to_unmap_anon() more scalable
  mm/rmap: Convert the struct anon_vma::mutex to an rwsem
  mm: migrate: Account a transhuge page properly when rate limiting
  mm: numa: Account for failed allocations and isolations as migration failures
  mm: numa: Add THP migration for the NUMA working set scanning fault case build fix
  mm: numa: Add THP migration for the NUMA working set scanning fault case.
  mm: sched: numa: Delay PTE scanning until a task is scheduled on a new node
  mm: sched: numa: Control enabling and disabling of NUMA balancing if !SCHED_DEBUG
  mm: sched: numa: Control enabling and disabling of NUMA balancing
  mm: sched: Adapt the scanning rate if a NUMA hinting fault does not migrate
  mm: numa: Use a two-stage filter to restrict pages being migrated for unlikely task<->node relationships
  mm: numa: migrate: Set last_nid on newly allocated page
  mm: numa: split_huge_page: Transfer last_nid on tail page
  mm: numa: Introduce last_nid to the page frame
  sched: numa: Slowly increase the scanning period as NUMA faults are handled
  mm: numa: Rate limit setting of pte_numa if node is saturated
  mm: numa: Rate limit the amount of memory that is migrated between nodes
  mm: numa: Structures for Migrate On Fault per NUMA migration rate limiting
  mm: numa: Migrate pages handled during a pmd_numa hinting fault
  mm: numa: Migrate on reference policy
  ...

diff --cc Documentation/kernel-parameters.txt
Simple merge

diff --cc arch/x86/Kconfig
Simple merge

diff --cc arch/x86/mm/pgtable.c
Simple merge

diff --cc include/asm-generic/pgtable.h
Simple merge

diff --cc include/linux/huge_mm.h
Simple merge

diff --cc include/linux/hugetlb.h
Simple merge

diff --cc include/linux/mempolicy.h
Simple merge

diff --cc include/linux/migrate.h
index 0b5865c,d52afb9..1e9f627
--- 1/include/linux/migrate.h
--- 2/include/linux/migrate.h
+++ b/include/linux/migrate.h
@@@ -7,22 -7,15 +7,31 @@@
  
  typedef struct page *new_page_t(struct page *, unsigned long private, int **);
  
 +/*
 + * Return values from addresss_space_operations.migratepage():
 + * - negative errno on page migration failure;
 + * - zero on page migration success;
 + *
 + * The balloon page migration introduces this special case where a 'distinct'
 + * return code is used to flag a successful page migration to unmap_and_move().
 + * This approach is necessary because page migration can race against balloon
 + * deflation procedure, and for such case we could introduce a nasty page leak
 + * if a successfully migrated balloon page gets released concurrently with
 + * migration's unmap_and_move() wrap-up steps.
 + */
 +#define MIGRATEPAGE_SUCCESS           0
 +#define MIGRATEPAGE_BALLOON_SUCCESS   1 /* special ret code for balloon page
 +                                         * sucessful migration case.
 +                                         */
+ enum migrate_reason {
+       MR_COMPACTION,
+       MR_MEMORY_FAILURE,
+       MR_MEMORY_HOTPLUG,
+       MR_SYSCALL,             /* also applies to cpusets */
+       MR_MEMPOLICY_MBIND,
+       MR_NUMA_MISPLACED,
+       MR_CMA
+ };
  
  #ifdef CONFIG_MIGRATION
  
@@@ -51,10 -43,9 +60,10 @@@ extern int migrate_huge_page_move_mappi
  #else
  
  static inline void putback_lru_pages(struct list_head *l) {}
 +static inline void putback_movable_pages(struct list_head *l) {}
  static inline int migrate_pages(struct list_head *l, new_page_t x,
                unsigned long private, bool offlining,
-               enum migrate_mode mode) { return -ENOSYS; }
+               enum migrate_mode mode, int reason) { return -ENOSYS; }
  static inline int migrate_huge_page(struct page *page, new_page_t x,
                unsigned long private, bool offlining,
                enum migrate_mode mode) { return -ENOSYS; }

diff --cc include/linux/mm.h
Simple merge

diff --cc include/linux/mm_types.h
Simple merge

diff --cc include/linux/mmzone.h
Simple merge

diff --cc include/linux/sched.h
Simple merge

diff --cc include/linux/vm_event_item.h
Simple merge

diff --cc init/Kconfig
index 2054e04,18e2a59..1a207ef
--- 1/init/Kconfig
--- 2/init/Kconfig
+++ b/init/Kconfig
@@@ -717,6 -696,51 +717,50 @@@ config LOG_BUF_SHIF
  config HAVE_UNSTABLE_SCHED_CLOCK
        bool
  
 -      default y
+ #
+ # For architectures that want to enable the support for NUMA-affine scheduler
+ # balancing logic:
+ #
+ config ARCH_SUPPORTS_NUMA_BALANCING
+       bool
+ 
+ # For architectures that (ab)use NUMA to represent different memory regions
+ # all cpu-local but of different latencies, such as SuperH.
+ #
+ config ARCH_WANT_NUMA_VARIABLE_LOCALITY
+       bool
+ 
+ #
+ # For architectures that are willing to define _PAGE_NUMA as _PAGE_PROTNONE
+ config ARCH_WANTS_PROT_NUMA_PROT_NONE
+       bool
+ 
+ config ARCH_USES_NUMA_PROT_NONE
+       bool
+       default y
+       depends on ARCH_WANTS_PROT_NUMA_PROT_NONE
+       depends on NUMA_BALANCING
+ 
+ config NUMA_BALANCING_DEFAULT_ENABLED
+       bool "Automatically enable NUMA aware memory/task placement"
+       default y
+       depends on NUMA_BALANCING
+       help
+         If set, autonumic NUMA balancing will be enabled if running on a NUMA
+         machine.
+ 
+ config NUMA_BALANCING
+       bool "Memory placement aware NUMA scheduler"
+       depends on ARCH_SUPPORTS_NUMA_BALANCING
+       depends on !ARCH_WANT_NUMA_VARIABLE_LOCALITY
+       depends on SMP && NUMA && MIGRATION
+       help
+         This option adds support for automatic NUMA aware memory/task placement.
+         The mechanism is quite primitive and is based on migrating memory when
+         it is references to the node the task is running on.
+ 
+         This system will be inactive on UMA systems.
+ 
  menuconfig CGROUPS
        boolean "Control Group support"
        depends on EVENTFD

diff --cc kernel/fork.c
Simple merge

diff --cc kernel/sched/core.c
Simple merge

diff --cc kernel/sched/fair.c
index 756f9f9,3e18f61..9af5af9
--- 1/kernel/sched/fair.c
--- 2/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@@ -5501,7 -5179,8 +5725,10 @@@ static void task_tick_fair(struct rq *r
                entity_tick(cfs_rq, se, queued);
        }
  
+       if (sched_feat_numa(NUMA))
+               task_tick_numa(rq, curr);
++
 +      update_rq_runnable_avg(rq, 1);
  }
  
  /*

diff --cc kernel/sched/features.h
Simple merge

diff --cc kernel/sched/sched.h
Simple merge

diff --cc kernel/sysctl.c
Simple merge

diff --cc mm/compaction.c
Simple merge

diff --cc mm/huge_memory.c
index 827d9c8,a24c9cb..d7ee169
--- 1/mm/huge_memory.c
--- 2/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@@ -19,7 -18,7 +19,8 @@@
  #include <linux/freezer.h>
  #include <linux/mman.h>
  #include <linux/pagemap.h>
+ #include <linux/migrate.h>
 +
  #include <asm/tlb.h>
  #include <asm/pgalloc.h>
  #include "internal.h"
@@@ -1383,8 -1184,17 +1460,18 @@@ int change_huge_pmd(struct vm_area_stru
        if (__pmd_trans_huge_lock(pmd, vma) == 1) {
                pmd_t entry;
                entry = pmdp_get_and_clear(mm, addr, pmd);
-               entry = pmd_modify(entry, newprot);
+               if (!prot_numa)
+                       entry = pmd_modify(entry, newprot);
+               else {
+                       struct page *page = pmd_page(*pmd);
+ 
+                       /* only check non-shared pages */
+                       if (page_mapcount(page) == 1 &&
+                           !pmd_numa(*pmd)) {
+                               entry = pmd_mknuma(entry);
+                       }
+               }
 +              BUG_ON(pmd_write(entry));
                set_pmd_at(mm, addr, pmd, entry);
                spin_unlock(&vma->vm_mm->page_table_lock);
                ret = 1;
@@@ -1727,9 -1548,8 +1817,9 @@@ int split_huge_page(struct page *page
        struct anon_vma *anon_vma;
        int ret = 1;
  
 +      BUG_ON(is_huge_zero_pfn(page_to_pfn(page)));
        BUG_ON(!PageAnon(page));
-       anon_vma = page_lock_anon_vma(page);
+       anon_vma = page_lock_anon_vma_read(page);
        if (!anon_vma)
                goto out;
        ret = 0;
@@@ -2226,15 -2050,31 +2316,15 @@@ static void collapse_huge_page(struct m
        hend = vma->vm_end & HPAGE_PMD_MASK;
        if (address < hstart || address + HPAGE_PMD_SIZE > hend)
                goto out;
 -
 -      if ((!(vma->vm_flags & VM_HUGEPAGE) && !khugepaged_always()) ||
 -          (vma->vm_flags & VM_NOHUGEPAGE))
 -              goto out;
 -
 -      if (!vma->anon_vma || vma->vm_ops)
 -              goto out;
 -      if (is_vma_temporary_stack(vma))
 +      if (!hugepage_vma_check(vma))
                goto out;
 -      VM_BUG_ON(vma->vm_flags & VM_NO_THP);
 -
 -      pgd = pgd_offset(mm, address);
 -      if (!pgd_present(*pgd))
 -              goto out;
 -
 -      pud = pud_offset(pgd, address);
 -      if (!pud_present(*pud))
 +      pmd = mm_find_pmd(mm, address);
 +      if (!pmd)
                goto out;
 -
 -      pmd = pmd_offset(pud, address);
 -      /* pmd can't go away or become huge under us */
 -      if (!pmd_present(*pmd) || pmd_trans_huge(*pmd))
 +      if (pmd_trans_huge(*pmd))
                goto out;
  
-       anon_vma_lock(vma->anon_vma);
+       anon_vma_lock_write(vma->anon_vma);
  
        pte = pte_offset_map(pmd, address);
        ptl = pte_lockptr(mm, pmd);

diff --cc mm/hugetlb.c
Simple merge

diff --cc mm/internal.h
Simple merge

diff --cc mm/ksm.c
Simple merge

diff --cc mm/memcontrol.c
Simple merge

diff --cc mm/memory-failure.c
Simple merge

diff --cc mm/memory.c
index db2e9e7,39edb11..e6a3b93
--- 1/mm/memory.c
--- 2/mm/memory.c
+++ b/mm/memory.c
@@@ -1503,9 -1518,11 +1504,11 @@@ struct page *follow_page(struct vm_area
                page = follow_huge_pmd(mm, address, pmd, flags & FOLL_WRITE);
                goto out;
        }
+       if ((flags & FOLL_NUMA) && pmd_numa(*pmd))
+               goto no_page_table;
        if (pmd_trans_huge(*pmd)) {
                if (flags & FOLL_SPLIT) {
 -                      split_huge_page_pmd(mm, pmd);
 +                      split_huge_page_pmd(vma, address, pmd);
                        goto split_fallthrough;
                }
                spin_lock(&mm->page_table_lock);
@@@ -3518,10 -3721,11 +3702,13 @@@ retry
  
                barrier();
                if (pmd_trans_huge(orig_pmd)) {
 -                      if (pmd_numa(*pmd))
 +                      unsigned int dirty = flags & FAULT_FLAG_WRITE;
 +
-                       if (dirty && !pmd_write(orig_pmd) &&
-                           !pmd_trans_splitting(orig_pmd)) {
++                      if (pmd_numa(orig_pmd))
+                               return do_huge_pmd_numa_page(mm, vma, address,
+                                                            orig_pmd, pmd);
+ 
 -                      if ((flags & FAULT_FLAG_WRITE) && !pmd_write(orig_pmd)) {
++                      if (dirty && !pmd_write(orig_pmd)) {
                                ret = do_huge_pmd_wp_page(mm, vma, address, pmd,
                                                          orig_pmd);
                                /*
@@@ -3532,10 -3736,8 +3719,11 @@@
                                if (unlikely(ret & VM_FAULT_OOM))
                                        goto retry;
                                return ret;
 +                      } else {
 +                              huge_pmd_set_accessed(mm, vma, address, pmd,
 +                                                    orig_pmd, dirty);
                        }
+ 
                        return 0;
                }
        }

diff --cc mm/memory_hotplug.c
Simple merge

diff --cc mm/mempolicy.c
Simple merge

diff --cc mm/migrate.c
index cae0271,6e46485..32efd80
--- 1/mm/migrate.c
--- 2/mm/migrate.c
+++ b/mm/migrate.c
@@@ -1027,7 -991,8 +1031,8 @@@ int migrate_pages(struct list_head *fro
                        case -EAGAIN:
                                retry++;
                                break;
 -                      case 0:
 +                      case MIGRATEPAGE_SUCCESS:
+                               nr_succeeded++;
                                break;
                        default:
                                /* Permanent failure */
@@@ -1036,8 -1001,14 +1041,14 @@@
                        }
                }
        }
 -      rc = 0;
 +      rc = nr_failed + retry;
  out:
+       if (nr_succeeded)
+               count_vm_events(PGMIGRATE_SUCCESS, nr_succeeded);
+       if (nr_failed)
+               count_vm_events(PGMIGRATE_FAIL, nr_failed);
+       trace_mm_migrate_pages(nr_succeeded, nr_failed, mode, reason);
+ 
        if (!swapwrite)
                current->flags &= ~PF_SWAPWRITE;
  

diff --cc mm/mmap.c
Simple merge

diff --cc mm/mprotect.c
index e8c3938,dce6fb4..3dca970
--- 1/mm/mprotect.c
--- 2/mm/mprotect.c
+++ b/mm/mprotect.c
@@@ -90,9 -142,11 +142,11 @@@ static inline unsigned long change_pmd_
                next = pmd_addr_end(addr, end);
                if (pmd_trans_huge(*pmd)) {
                        if (next - addr != HPAGE_PMD_SIZE)
 -                              split_huge_page_pmd(vma->vm_mm, pmd);
 +                              split_huge_page_pmd(vma, addr, pmd);
-                       else if (change_huge_pmd(vma, pmd, addr, newprot))
+                       else if (change_huge_pmd(vma, pmd, addr, newprot, prot_numa)) {
+                               pages += HPAGE_PMD_NR;
                                continue;
+                       }
                        /* fall through */
                }
                if (pmd_none_or_clear_bad(pmd))

diff --cc mm/mremap.c
Simple merge

diff --cc mm/page_alloc.c
index 83637df,73f226a..d037c8b
--- 1/mm/page_alloc.c
--- 2/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@@ -5800,10 -5714,11 +5807,11 @@@ static int __alloc_contig_migrate_range
  
                ret = migrate_pages(&cc->migratepages,
                                    alloc_migrate_target,
-                                   0, false, MIGRATE_SYNC);
+                                   0, false, MIGRATE_SYNC,
+                                   MR_CMA);
        }
  
 -      putback_lru_pages(&cc->migratepages);
 +      putback_movable_pages(&cc->migratepages);
        return ret > 0 ? 0 : ret;
  }
  

diff --cc mm/rmap.c
Simple merge

diff --cc mm/vmstat.c
Simple merge